Expansible wedge.



UNITED sTATEs PATENT oEEicE.

. l Specification of Lettersl Patent.

Patented Dec. 5, 1905.

, Application nea December 3,1904. semina. 235.313.

.T a/ZZ whom it may concern:

Be it known that I, HARVEY FARRINGTON, a citizen of the United States, and aresident of Yonkers, in the county of Westchester and State of New York, have inventedcertain new and useful Improvements in Expansible Bolts, which improvements are fully set forth in the following specification.

This invention relates to devices for exertingv an expansive force either for the purpose of disrupting a surrounding body or for lockingthe device into a surrounding body,`as in the case of anchor-bolts or lewises; and more particularly it relates to devices for this purpose wherein the expansion is accomplished by means of a rotary expander acting 5o fiaforenamed detached fromthe general conon an expansible spiral keeper or an expansible sleeve conjoined with said keeper'.

The object of my invention is to provide means for disrupting or cleavingmasses of stone, wood, or other material or for locking an anchor-bolt or lewis within a surrounding mass of material and. to accomplish this by making use of the power of a screw, yet without the necessity of using screw-threads in the material to which the device is tol be applied'. lThe invention' consists incertain combinations and arrangements of parts-and certain details of construction, allof which will'be more specifically hereinafter referred to, and set forth in the appended claims.

shown in section, in conjunction therewith andto better illustrate the practical application thereof, a fragment of a socketed or recessed body er object, as a marble slab, cement block, Fig. 2 is a view similar toI stone, `or the like. Fig. 1, showing the device applied for service-with its keeper-socket removed.-` Iig.V 3 is a fragmentary sectional view mainly similar to-Fig. 2, thescale beingenlarged over that of Figs. 1 and 2 to more clearly illustrate the mode' of operation ofy the device. Fig. 4 is a Vperspective View of the keeper-socket struction. p l

My invention comprises, in a general sense, an elongated screw-threaded expander and a spiralsomewha t-yielding keeper su rrounding the vexpander and engaging fthe screwathreads thereofythe cross-sectional contour of the spiral keeper being such that the friction between said keeper and said expander or the screw- .threads of the latter is reduced to a minimum,

while at the same time said keeper presents at tact-facefor bearing against the surrounding surface of its inclosing mass or against the il',I terior surface of an expansible socket which may be used to house said keeper.

kits outer -side an adequate frictional spiral con-` Y,

Having reference to the accompanying drawings, 2 denotes a keeper formed from any suitable material, though by-preference amaterial somewhat yielding or resilient, as brass, or capable of being tempered or rendered more or less resilient, as steel wire, said keeper having the general contour or form of a spiral and being expansible approximately circumferentially. Y

In conjunction with the keeper 2 I purpose to makeuse of anexpande'rg the same being here shown as taking the general form `of a holt and comprising a main portion 3 of a given suitable diameter and of any appropriate contour in cross-section, a medial tapered'por'- tion 3', merging at its smaller-diameter into a reduced portion 3;the latter being ofa'ufniform-diameter,` though reduced as compared` with the diameter of the portion 3 and preferably terminating in -a tapered tip-4t.r It is essential that the tapered portion?!V be provided with a spiral recess, as 4', for-the recep tion-of one or more o'f such of the-coilso'fthe keeper 2'as may be'found desirable, in practice to'expand, said recess being formed `in this instancey by theV -rib or Webi", which' spirally traversesthe taperedl portionB andf approximates the character of a screw-thread. j I prefer that; the recess 4 be extended "also lcontinuously along thereduced` portion 3U.'

and-likewise along thetapered tip4, vwhich ex-j tension of said recess, as will 4be readily un-j derstood,'maybe duly and conveniently accomplished by'raccordingly extending the rib, or web-L", and, in any event-when said recess IOO is occupied by vone or more ofthe coilsof the IIO In many instances, particularly where the pocket 6, designed to receive the device as a whole, is formed in material somewhat malleable, and it becomes desirable to interpose 5 between the keeper 2 and the. wall of said pocket an element whereby an extensive frictional holding effect may be had on said wall and without appreciable indentation thereof, I provide a circumferentially-expansible socket or shell 6', here shown as taking the character of a longitudinally-split sleeve having inturned annular lips or lianges 6" 6 at its respective ends and containing and substantially housing the keeper 2, the latter being disposed or adjusted within said socket prior to the formation of either or both of the lips V--erlianges 65 6. The socket or shell 6 may be produced' from any suitable material, though a material having some resiliency or admittingI of being given more or less resiliency, as brass or steel in sheet form, is prelferred.

The keeper 2 is preferably formed from a piece of stock or wire circular in cross-section, uniform in diameter throughout its length, whereby a line-contact is secured spiral] y between said keeper and said expander and friction in the operation of the device is accordingly materially reduced, while the corresponding outer face thereof has a substantial bearing on the surrounding mass, in connection with which the device may be used, particularly when the coils of said keeper are caused to penetrate somewhat said mass, as shown. The foregoing remarks apply also where the socket or shell 6 is availed of, it lbeing only necessary, as will be readily understood, to make the opening or pocket 6 of a diameter suiiiciently large to receive thedevice with the socket or shell aforenamed applied thereto.

In applying my improved expansible bolt to practical purposes a pocket 6 of suitable diameter is formed in the usual way in a stone, cement block, beam, marble slab, or other desired body or object, a fragment thereof being shown in the drawings and denoted by the reference-numeral Then the device, with or without the socket or shell 6 and with the keeper 2 adjusted wholly or partially along the reduced portion 3 of the expander aforenamed and in readiness for occupancy of the recess 4, spirally traversing the tapered portion 3' of said expander, is inserted into the pocket 6, with its headed portion projecting therefrom, whereupon, by means of a suitable tool or implement applied as to the head 5, the expander aforenamed is rotated in a direction proper to urge it homeward, with the result that a coil or a plurality of the coils of the keeper 2 is or are caused to occupy said recess spirally traversing the tapered portion 3 and is or are expanded through the medium of said tapered portion laterally or substantially eircumferentially for a wedging, binding, or locking action on the wall of the pocket 6, such wedging, binding, 0r locking action being applied directly to such wall or indirectly thereto through the medium of the socket or shell 6', the latter being expansible circumferentially, as hereinbefore stated.

Where the body or object in conjunction with which my improved device is being used is formed from or consists of material more or less malleable, the coil or coils of the keeper 2 when expanded, as above stated, will tend to indent or become embedded somewhat in the wall of the pocket 6, as more clearly illustrated in Fig. 8, and where this indenting eect is not desired the socket or shell 6' may be availed of, as hereinbefore alluded to.

My improved expansible bolt will be found highly serviceable in the operation of hoisting stones, cement blocks, and similar bodies or objects, splitting or severing the same, a plurality of said bolts being ordinarily used in this connection and a like number of pockets 6, each to receive one of said bolts, being formed in the body or object which it is dcsired to thus split or sever, as a terminal post for a switchboard, as a means for locking or retaining one article or object in conjunction with or upon another, and, in fact, in a multiplicity of situations where it is desired to lock or fasten a member, such as 3, whether headed or not, in position for service or to utilize the wedging power or effect of the device as a whole for locking, severing, or grappling purposes. Hence it will be seen that my improved expansible bolt is well adapted for the purposes for which it is designed, and, further, that the same may be modified to a considerable extent, particularly as regards the cross-sectional contour and character of the stock from which the keeper 2 is formed, the manner of providing the recess 4Q the relative arrangement or disposition of the rib or web 4 with respect to the expander of the device, the character and material of the socket or shell 6, the extent of the taper 3, and various minor details of construction ot' the separate parts or elements of the device without materially departing from the spirit and principle of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a device of the class herein described, the combination with an elongated, tapering, screw-threaded expander, and a spiral keeper surrounding the same and engaging with the screw-threads thereof, of a circumferentiallyexpansible socket, surrounding said keeper and adapted to be acted upon and circumferentially expanded, upon the insertion and rotation of said expander in said keeper, substantially as herein specified.

2. In a device of the class herein described, the combination with a tapering, elongated, screw-threaded expander, and a spiral keeper IOO 10 keeper surrounding the same and engaging 1 with the screw-,threads,thereofa of a circumferentially expansible socket surrounding said keeper and adapted to be acted upon and expanded upon the insertion and rotation of said expander in said keeper. Y 1 HARVEY FARRINGTON.

Witnesses:

W. H. RUBY, F. B. WRIGHT. 

